<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
<style>
    body {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100vw;
        height: 100vh;
    }
    .btn {
        box-sizing: border-box;
        box-shadow: none;
        border: none;
        font: 2em/1 sans-serif;
        padding: 30px 100px;
        letter-spacing: 5px;
        color: white;
        border: solid 4px transparent;
        border-image: linear-gradient(45deg, pink, skyblue);
        border-image-slice: 1;
        background: linear-gradient(45deg, pink, skyblue);
        -webkit-background-clip: text;
        background-clip: text;
        text-fill-color: transparent;
    }
</style>

</head>
<body>
<a role="button" class="btn">BUTTON</a>
</body>
</html>